Please see the attached images. The first one shows my client's website as it is being loaded from my local computer. Notice that there is a purple background to the header menu. This is how the site is supposed to load. On my client's computers, however, the purple background is not visible. Instead, there is a transparent background. What do I need to do to make the purple menu bar appear on ALL browsers?

Comments
the screenshots you pasted above, does not work unfortunately.